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SubjectRe: [PATCH] nfs: fix nfs_writepage()
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On Wed, 2007-10-17 at 11:45 -0400, Trond Myklebust wrote:
> On Wed, 2007-10-17 at 17:30 +0200, Peter Zijlstra wrote:
>
> > The thing is, swapper_space just calls ->writepage() and expects the
> > page to be written out. So either the a_ops usage of swapper_space is
> > deviant or NFS' is.
>
> Could somebody please document WTF writepage() is supposed to do, and
> WTF page_mkwrite() is for?
>
> I thought that page_mkwrite() was supposed to finally allow us to deal
> with dirty pages in a clean manner: the caller gets to tell the
> filesystem that it wants the entire page written out, and then dirties
> the page. What is the point if the VM then expects to be able to
> circumvent this?

Put differently:
* _who_ is dirtying the page when the swapper is trying to write
the page out?
* why are they not calling either page_mkwrite() or
commit_write()?

Trond

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